| Message ID | 1590074615-10787-3-git-send-email-vbadigan@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Internal voltage control for qcom SDHC | expand |
On Thu 21 May 08:23 PDT 2020, Veerabhadrarao Badiganti wrote: > On qcom SD host controllers voltage switching be done after the HW > is ready for it. The HW informs its readiness through power irq. > The voltage switching should happen only then. > > Use the internal voltage switching and then control the voltage > switching using power irq. > > Set the regulator load as well so that regulator can be configured > in LPM mode when in is not being used. > > Co-developed-by: Asutosh Das <asutoshd@codeaurora.org> > Signed-off-by: Asutosh Das <asutoshd@codeaurora.org> > Co-developed-by: Vijay Viswanath <vviswana@codeaurora.org> > Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org> > Co-developed-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> > Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> Looks better, thanks. > --- > drivers/mmc/host/sdhci-msm.c | 207 +++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 198 insertions(+), 9 deletions(-) > > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c [..] > static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host) > @@ -1298,6 +1302,71 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host, > sdhci_msm_hs400(host, &mmc->ios); > } > > +static int sdhci_msm_set_vmmc(struct mmc_host *mmc) > +{ > + int ret; > + > + if (IS_ERR(mmc->supply.vmmc)) > + return 0; > + > + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd); > + if (ret) > + dev_err(mmc_dev(mmc), "%s: vmmc set ocr with vdd=%d failed: %d\n", > + mmc_hostname(mmc), mmc->ios.vdd, ret); Missed this one on v1, in the event that mmc_regulator_set_ocr() return a non-zero value it has already printed an error message. So please replace the tail with just: return mmc_regulator_set_ocr(...); > + > + return ret; > +} > + > +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host, > + struct mmc_host *mmc, bool level) > +{ > + int load, ret; > + struct mmc_ios ios; > + > + if (IS_ERR(mmc->supply.vqmmc) || > + (mmc->ios.power_mode == MMC_POWER_UNDEFINED) || > + (msm_host->vqmmc_enabled == level)) > + return 0; > + > + if (msm_host->vqmmc_load) { > + load = level ? msm_host->vqmmc_load : 0; > + ret = regulator_set_load(mmc->supply.vqmmc, load); Sorry for the late reply on v1, but please see my explanation regarding load and always-on regulators there. > + if (ret) { > + dev_err(mmc_dev(mmc), "%s: vqmmc set load failed: %d\n", > + mmc_hostname(mmc), ret); > + goto out; > + } > + } > + > + if (level) { > + /* Set the IO voltage regulator to default voltage level */ > + if (msm_host->caps_0 & CORE_3_0V_SUPPORT) > + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330; > + else if (msm_host->caps_0 & CORE_1_8V_SUPPORT) > + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180; > + > + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) { > + ret = mmc_regulator_set_vqmmc(mmc, &ios); > + if (ret < 0) { > + dev_err(mmc_dev(mmc), "%s: vqmmc set volgate failed: %d\n", > + mmc_hostname(mmc), ret); > + goto out; > + } > + } > + ret = regulator_enable(mmc->supply.vqmmc); > + } else { > + ret = regulator_disable(mmc->supply.vqmmc); > + } > + > + if (ret) > + dev_err(mmc_dev(mmc), "%s: vqmm %sable failed: %d\n", > + mmc_hostname(mmc), level ? "en":"dis", ret); > + else > + msm_host->vqmmc_enabled = level; > +out: > + return ret; > +} [..] > +static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc, > + struct mmc_ios *ios) > +{ > + struct sdhci_host *host = mmc_priv(mmc); > + u16 ctrl, status; > + > + /* > + * Signal Voltage Switching is only applicable for Host Controllers > + * v3.00 and above. > + */ > + if (host->version < SDHCI_SPEC_300) > + return 0; > + > + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); > + > + switch (ios->signal_voltage) { > + case MMC_SIGNAL_VOLTAGE_330: > + if (!(host->flags & SDHCI_SIGNALING_330)) > + return -EINVAL; > + > + /* Set 1.8V Signal Enable in the Host Control2 register to 0 */ > + ctrl &= ~SDHCI_CTRL_VDD_180; > + break; > + case MMC_SIGNAL_VOLTAGE_180: > + if (!(host->flags & SDHCI_SIGNALING_180)) > + return -EINVAL; > + > + /* > + * Enable 1.8V Signal Enable in the Host Control2 > + * register > + */ > + ctrl |= SDHCI_CTRL_VDD_180; > + break; > + case MMC_SIGNAL_VOLTAGE_120: > + if (!(host->flags & SDHCI_SIGNALING_120)) > + return -EINVAL; > + return 0; > + default: > + /* No signal voltage switch required */ > + return 0; > + } > + > + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); > + > + /* Wait for 5ms */ > + usleep_range(5000, 5500); > + > + /* regulator output should be stable within 5 ms */ > + status = !!(ctrl & SDHCI_CTRL_VDD_180); > + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); > + if (!!(ctrl & SDHCI_CTRL_VDD_180) == status) You should be able to drop the !! both here and when assigning status. Overall this looks neater, thanks for reworking it. Regards, Bjorn
Hi Bjorn, On 5/22/2020 12:37 AM, Bjorn Andersson wrote: > On Thu 21 May 08:23 PDT 2020, Veerabhadrarao Badiganti wrote: > >> On qcom SD host controllers voltage switching be done after the HW >> is ready for it. The HW informs its readiness through power irq. >> The voltage switching should happen only then. >> >> Use the internal voltage switching and then control the voltage >> switching using power irq. >> >> Set the regulator load as well so that regulator can be configured >> in LPM mode when in is not being used. >> >> Co-developed-by: Asutosh Das <asutoshd@codeaurora.org> >> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org> >> Co-developed-by: Vijay Viswanath <vviswana@codeaurora.org> >> Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org> >> Co-developed-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> >> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> > Looks better, thanks. > >> --- >> drivers/mmc/host/sdhci-msm.c | 207 +++++++++++++++++++++++++++++++++++++++++-- >> 1 file changed, 198 insertions(+), 9 deletions(-) >> >> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > [..] >> static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host) >> @@ -1298,6 +1302,71 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host, >> sdhci_msm_hs400(host, &mmc->ios); >> } >> >> +static int sdhci_msm_set_vmmc(struct mmc_host *mmc) >> +{ >> + int ret; >> + >> + if (IS_ERR(mmc->supply.vmmc)) >> + return 0; >> + >> + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd); >> + if (ret) >> + dev_err(mmc_dev(mmc), "%s: vmmc set ocr with vdd=%d failed: %d\n", >> + mmc_hostname(mmc), mmc->ios.vdd, ret); > Missed this one on v1, in the event that mmc_regulator_set_ocr() return > a non-zero value it has already printed an error message. So please > replace the tail with just: > > return mmc_regulator_set_ocr(...); > >> + >> + return ret; >> +} >> + >> +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host, >> + struct mmc_host *mmc, bool level) >> +{ >> + int load, ret; >> + struct mmc_ios ios; >> + >> + if (IS_ERR(mmc->supply.vqmmc) || >> + (mmc->ios.power_mode == MMC_POWER_UNDEFINED) || >> + (msm_host->vqmmc_enabled == level)) >> + return 0; >> + >> + if (msm_host->vqmmc_load) { >> + load = level ? msm_host->vqmmc_load : 0; >> + ret = regulator_set_load(mmc->supply.vqmmc, load); > Sorry for the late reply on v1, but please see my explanation regarding > load and always-on regulators there. <Merging your comment from V1 here> >> You should still call regulator_enable()/regulator_disable() on your >> consumer regulator in this driver. When you do this the regulator core >> will conclude that the regulator_dev (i.e. the part that represents the >> hardware) is marked always_on and will not enable/disable the regulator. >> But it will still invoke _regulator_handle_consumer_enable() and >> _regulator_handle_consumer_disable(), which will aggregate the "load" of >> all client regulators and update the regulator's load. >> So this will apply the load as you expect regardless of it being >> supplied by a regulator marked as always_on. Since I'm not turning off this regulator for eMMC, I wanted to keep it in LPM mode to save some power. When the regulator configured in auto mode (RPMH_REGULATOR_MODE_AUTO) it switches to LPM/HPM mode based on the active load. So i have to minimize my driver load requirement so that I can let this regulator in LPM mode. So i need to set load every-time I disable/enable the regulator. >> + if (ret) { >> + dev_err(mmc_dev(mmc), "%s: vqmmc set load failed: %d\n", >> + mmc_hostname(mmc), ret); >> + goto out; >> + } >> + } >> + >> + if (level) { >> + /* Set the IO voltage regulator to default voltage level */ >> + if (msm_host->caps_0 & CORE_3_0V_SUPPORT) >> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330; >> + else if (msm_host->caps_0 & CORE_1_8V_SUPPORT) >> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180; >> + >> + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) { >> + ret = mmc_regulator_set_vqmmc(mmc, &ios); >> + if (ret < 0) { >> + dev_err(mmc_dev(mmc), "%s: vqmmc set volgate failed: %d\n", >> + mmc_hostname(mmc), ret); >> + goto out; >> + } >> + } >> + ret = regulator_enable(mmc->supply.vqmmc); >> + } else { >> + ret = regulator_disable(mmc->supply.vqmmc); >> + } >> + >> + if (ret) >> + dev_err(mmc_dev(mmc), "%s: vqmm %sable failed: %d\n", >> + mmc_hostname(mmc), level ? "en":"dis", ret); >> + else >> + msm_host->vqmmc_enabled = level; >> +out: >> + return ret; >> +} > [..] >> +static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc, >> + struct mmc_ios *ios) >> +{ >> + struct sdhci_host *host = mmc_priv(mmc); >> + u16 ctrl, status; >> + >> + /* >> + * Signal Voltage Switching is only applicable for Host Controllers >> + * v3.00 and above. >> + */ >> + if (host->version < SDHCI_SPEC_300) >> + return 0; >> + >> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); >> + >> + switch (ios->signal_voltage) { >> + case MMC_SIGNAL_VOLTAGE_330: >> + if (!(host->flags & SDHCI_SIGNALING_330)) >> + return -EINVAL; >> + >> + /* Set 1.8V Signal Enable in the Host Control2 register to 0 */ >> + ctrl &= ~SDHCI_CTRL_VDD_180; >> + break; >> + case MMC_SIGNAL_VOLTAGE_180: >> + if (!(host->flags & SDHCI_SIGNALING_180)) >> + return -EINVAL; >> + >> + /* >> + * Enable 1.8V Signal Enable in the Host Control2 >> + * register >> + */ >> + ctrl |= SDHCI_CTRL_VDD_180; >> + break; >> + case MMC_SIGNAL_VOLTAGE_120: >> + if (!(host->flags & SDHCI_SIGNALING_120)) >> + return -EINVAL; >> + return 0; >> + default: >> + /* No signal voltage switch required */ >> + return 0; >> + } >> + >> + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); >> + >> + /* Wait for 5ms */ >> + usleep_range(5000, 5500); >> + >> + /* regulator output should be stable within 5 ms */ >> + status = !!(ctrl & SDHCI_CTRL_VDD_180); >> + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); >> + if (!!(ctrl & SDHCI_CTRL_VDD_180) == status) > You should be able to drop the !! both here and when assigning status. > > Overall this looks neater, thanks for reworking it. > > Regards, > Bjorn Thanks Veera
On Fri 22 May 06:27 PDT 2020, Veerabhadrarao Badiganti wrote: > Hi Bjorn, > > On 5/22/2020 12:37 AM, Bjorn Andersson wrote: > > On Thu 21 May 08:23 PDT 2020, Veerabhadrarao Badiganti wrote: > > > > > On qcom SD host controllers voltage switching be done after the HW > > > is ready for it. The HW informs its readiness through power irq. > > > The voltage switching should happen only then. > > > > > > Use the internal voltage switching and then control the voltage > > > switching using power irq. > > > > > > Set the regulator load as well so that regulator can be configured > > > in LPM mode when in is not being used. > > > > > > Co-developed-by: Asutosh Das <asutoshd@codeaurora.org> > > > Signed-off-by: Asutosh Das <asutoshd@codeaurora.org> > > > Co-developed-by: Vijay Viswanath <vviswana@codeaurora.org> > > > Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org> > > > Co-developed-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> > > > Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> > > Looks better, thanks. > > > > > --- > > > drivers/mmc/host/sdhci-msm.c | 207 +++++++++++++++++++++++++++++++++++++++++-- > > > 1 file changed, 198 insertions(+), 9 deletions(-) > > > > > > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > > [..] > > > static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host) > > > @@ -1298,6 +1302,71 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host, > > > sdhci_msm_hs400(host, &mmc->ios); > > > } > > > +static int sdhci_msm_set_vmmc(struct mmc_host *mmc) > > > +{ > > > + int ret; > > > + > > > + if (IS_ERR(mmc->supply.vmmc)) > > > + return 0; > > > + > > > + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd); > > > + if (ret) > > > + dev_err(mmc_dev(mmc), "%s: vmmc set ocr with vdd=%d failed: %d\n", > > > + mmc_hostname(mmc), mmc->ios.vdd, ret); > > Missed this one on v1, in the event that mmc_regulator_set_ocr() return > > a non-zero value it has already printed an error message. So please > > replace the tail with just: > > > > return mmc_regulator_set_ocr(...); > > > > > + > > > + return ret; > > > +} > > > + > > > +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host, > > > + struct mmc_host *mmc, bool level) > > > +{ > > > + int load, ret; > > > + struct mmc_ios ios; > > > + > > > + if (IS_ERR(mmc->supply.vqmmc) || > > > + (mmc->ios.power_mode == MMC_POWER_UNDEFINED) || > > > + (msm_host->vqmmc_enabled == level)) > > > + return 0; > > > + > > > + if (msm_host->vqmmc_load) { > > > + load = level ? msm_host->vqmmc_load : 0; > > > + ret = regulator_set_load(mmc->supply.vqmmc, load); > > Sorry for the late reply on v1, but please see my explanation regarding > > load and always-on regulators there. > > <Merging your comment from V1 here> > > >> You should still call regulator_enable()/regulator_disable() on your > >> consumer regulator in this driver. When you do this the regulator core > >> will conclude that the regulator_dev (i.e. the part that represents the > >> hardware) is marked always_on and will not enable/disable the regulator. > > >> But it will still invoke _regulator_handle_consumer_enable() and > >> _regulator_handle_consumer_disable(), which will aggregate the "load" of > >> all client regulators and update the regulator's load. > > >> So this will apply the load as you expect regardless of it being > >> supplied by a regulator marked as always_on. > > Since I'm not turning off this regulator for eMMC, I wanted to keep it in > LPM mode > to save some power. > When the regulator configured in auto mode (RPMH_REGULATOR_MODE_AUTO) it > switches to LPM/HPM mode based on the active load. > So i have to minimize my driver load requirement so that I can let this > regulator > in LPM mode. > So i need to set load every-time I disable/enable the regulator. > You call regulator_enable(vqmmc) and regulator_disable() below, so you are telling the regulator framework that your struct regulator should be "on" or "off". This will cause the sum of all struct regulator's for the underlying struct regulator_dev to be recalculated. So after calling regulator_disable() below your effective addition to the load calculation is 0, regardless of which load you have specified. Independent of this the property regulator-always-on (always_on in struct regulator_dev) will determine if the enable/disable request will actually be sent to the RPMh. So, if you where to not call regulator_disable() for eMMC your argument is correct, but as far as I can see you are and you're relying on the regulator core to keep it always-on - and then the load logic is in effect still. Regards, Bjorn > > > + if (ret) { > > > + dev_err(mmc_dev(mmc), "%s: vqmmc set load failed: %d\n", > > > + mmc_hostname(mmc), ret); > > > + goto out; > > > + } > > > + } > > > + > > > + if (level) { > > > + /* Set the IO voltage regulator to default voltage level */ > > > + if (msm_host->caps_0 & CORE_3_0V_SUPPORT) > > > + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330; > > > + else if (msm_host->caps_0 & CORE_1_8V_SUPPORT) > > > + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180; > > > + > > > + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) { > > > + ret = mmc_regulator_set_vqmmc(mmc, &ios); > > > + if (ret < 0) { > > > + dev_err(mmc_dev(mmc), "%s: vqmmc set volgate failed: %d\n", > > > + mmc_hostname(mmc), ret); > > > + goto out; > > > + } > > > + } > > > + ret = regulator_enable(mmc->supply.vqmmc); > > > + } else { > > > + ret = regulator_disable(mmc->supply.vqmmc); > > > + } > > > + > > > + if (ret) > > > + dev_err(mmc_dev(mmc), "%s: vqmm %sable failed: %d\n", > > > + mmc_hostname(mmc), level ? "en":"dis", ret); > > > + else > > > + msm_host->vqmmc_enabled = level; > > > +out: > > > + return ret; > > > +}
On 5/22/2020 10:34 PM, Bjorn Andersson wrote: > On Fri 22 May 06:27 PDT 2020, Veerabhadrarao Badiganti wrote: > >> Hi Bjorn, >> >> On 5/22/2020 12:37 AM, Bjorn Andersson wrote: >>> On Thu 21 May 08:23 PDT 2020, Veerabhadrarao Badiganti wrote: >>> >>>> On qcom SD host controllers voltage switching be done after the HW >>>> is ready for it. The HW informs its readiness through power irq. >>>> The voltage switching should happen only then. >>>> >>>> Use the internal voltage switching and then control the voltage >>>> switching using power irq. >>>> >>>> Set the regulator load as well so that regulator can be configured >>>> in LPM mode when in is not being used. >>>> >>>> Co-developed-by: Asutosh Das <asutoshd@codeaurora.org> >>>> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org> >>>> Co-developed-by: Vijay Viswanath <vviswana@codeaurora.org> >>>> Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org> >>>> Co-developed-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> >>>> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org> >>> Looks better, thanks. >>> >>>> --- >>>> drivers/mmc/host/sdhci-msm.c | 207 +++++++++++++++++++++++++++++++++++++++++-- >>>> 1 file changed, 198 insertions(+), 9 deletions(-) >>>> >>>> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c >>> [..] >>>> static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host) >>>> @@ -1298,6 +1302,71 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host, >>>> sdhci_msm_hs400(host, &mmc->ios); >>>> } >>>> +static int sdhci_msm_set_vmmc(struct mmc_host *mmc) >>>> +{ >>>> + int ret; >>>> + >>>> + if (IS_ERR(mmc->supply.vmmc)) >>>> + return 0; >>>> + >>>> + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd); >>>> + if (ret) >>>> + dev_err(mmc_dev(mmc), "%s: vmmc set ocr with vdd=%d failed: %d\n", >>>> + mmc_hostname(mmc), mmc->ios.vdd, ret); >>> Missed this one on v1, in the event that mmc_regulator_set_ocr() return >>> a non-zero value it has already printed an error message. So please >>> replace the tail with just: >>> >>> return mmc_regulator_set_ocr(...); >>> >>>> + >>>> + return ret; >>>> +} >>>> + >>>> +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host, >>>> + struct mmc_host *mmc, bool level) >>>> +{ >>>> + int load, ret; >>>> + struct mmc_ios ios; >>>> + >>>> + if (IS_ERR(mmc->supply.vqmmc) || >>>> + (mmc->ios.power_mode == MMC_POWER_UNDEFINED) || >>>> + (msm_host->vqmmc_enabled == level)) >>>> + return 0; >>>> + >>>> + if (msm_host->vqmmc_load) { >>>> + load = level ? msm_host->vqmmc_load : 0; >>>> + ret = regulator_set_load(mmc->supply.vqmmc, load); >>> Sorry for the late reply on v1, but please see my explanation regarding >>> load and always-on regulators there. >> <Merging your comment from V1 here> >> >>>> You should still call regulator_enable()/regulator_disable() on your >>>> consumer regulator in this driver. When you do this the regulator core >>>> will conclude that the regulator_dev (i.e. the part that represents the >>>> hardware) is marked always_on and will not enable/disable the regulator. >>>> But it will still invoke _regulator_handle_consumer_enable() and >>>> _regulator_handle_consumer_disable(), which will aggregate the "load" of >>>> all client regulators and update the regulator's load. >>>> So this will apply the load as you expect regardless of it being >>>> supplied by a regulator marked as always_on. >> Since I'm not turning off this regulator for eMMC, I wanted to keep it in >> LPM mode >> to save some power. >> When the regulator configured in auto mode (RPMH_REGULATOR_MODE_AUTO) it >> switches to LPM/HPM mode based on the active load. >> So i have to minimize my driver load requirement so that I can let this >> regulator >> in LPM mode. >> So i need to set load every-time I disable/enable the regulator. >> > You call regulator_enable(vqmmc) and regulator_disable() below, so you > are telling the regulator framework that your struct regulator should be > "on" or "off". > > This will cause the sum of all struct regulator's for the underlying > struct regulator_dev to be recalculated. So after calling > regulator_disable() below your effective addition to the load > calculation is 0, regardless of which load you have specified. > > Independent of this the property regulator-always-on (always_on in > struct regulator_dev) will determine if the enable/disable request will > actually be sent to the RPMh. > > > So, if you where to not call regulator_disable() for eMMC your argument > is correct, but as far as I can see you are and you're relying on the > regulator core to keep it always-on - and then the load logic is in > effect still. Thanks for the details Bjorn. My requirement is, for eMMC i shouldn't be turning this regulator off. But has to configure in LPM mode. For SD-card, i have to turn-off this regulator. So I'm planning to update the logic as below, let me know if you have any other suggestions. +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host, + struct mmc_host *mmc, bool level) +{ + int ret; + bool always_on; + + if (IS_ERR(mmc->supply.vqmmc) || + (mmc->ios.power_mode == MMC_POWER_UNDEFINED)) + return 0; + /* + * For eMMC don't turn off Vqmmc, Instead just configure it in LPM + * and HPM modes by setting the right amount of load. + */ + always_on = mmc->card && mmc_card_mmc(mmc->card); + + if (always_on) + ret = msm_config_vqmmc_mode(msm_host, mmc, level); + else + ret = msm_toggle_vqmmc(msm_host, mmc, level); + + return ret; +} > Regards, > Bjorn > >>>> + if (ret) { >>>> + dev_err(mmc_dev(mmc), "%s: vqmmc set load failed: %d\n", >>>> + mmc_hostname(mmc), ret); >>>> + goto out; >>>> + } >>>> + } >>>> + >>>> + if (level) { >>>> + /* Set the IO voltage regulator to default voltage level */ >>>> + if (msm_host->caps_0 & CORE_3_0V_SUPPORT) >>>> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330; >>>> + else if (msm_host->caps_0 & CORE_1_8V_SUPPORT) >>>> + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180; >>>> + >>>> + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) { >>>> + ret = mmc_regulator_set_vqmmc(mmc, &ios); >>>> + if (ret < 0) { >>>> + dev_err(mmc_dev(mmc), "%s: vqmmc set volgate failed: %d\n", >>>> + mmc_hostname(mmc), ret); >>>> + goto out; >>>> + } >>>> + } >>>> + ret = regulator_enable(mmc->supply.vqmmc); >>>> + } else { >>>> + ret = regulator_disable(mmc->supply.vqmmc); >>>> + } >>>> + >>>> + if (ret) >>>> + dev_err(mmc_dev(mmc), "%s: vqmm %sable failed: %d\n", >>>> + mmc_hostname(mmc), level ? "en":"dis", ret); >>>> + else >>>> + msm_host->vqmmc_enabled = level; >>>> +out: >>>> + return ret; >>>> +}
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 97758fa..6211ab4 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -36,7 +36,9 @@ #define CORE_PWRCTL_IO_LOW BIT(2) #define CORE_PWRCTL_IO_HIGH BIT(3) #define CORE_PWRCTL_BUS_SUCCESS BIT(0) +#define CORE_PWRCTL_BUS_FAIL BIT(1) #define CORE_PWRCTL_IO_SUCCESS BIT(2) +#define CORE_PWRCTL_IO_FAIL BIT(3) #define REQ_BUS_OFF BIT(0) #define REQ_BUS_ON BIT(1) #define REQ_IO_LOW BIT(2) @@ -263,6 +265,8 @@ struct sdhci_msm_host { bool use_cdr; u32 transfer_mode; bool updated_ddr_cfg; + u32 vqmmc_load; + bool vqmmc_enabled; }; static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host) @@ -1298,6 +1302,71 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host, sdhci_msm_hs400(host, &mmc->ios); } +static int sdhci_msm_set_vmmc(struct mmc_host *mmc) +{ + int ret; + + if (IS_ERR(mmc->supply.vmmc)) + return 0; + + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, mmc->ios.vdd); + if (ret) + dev_err(mmc_dev(mmc), "%s: vmmc set ocr with vdd=%d failed: %d\n", + mmc_hostname(mmc), mmc->ios.vdd, ret); + + return ret; +} + +static int sdhci_msm_set_vqmmc(struct sdhci_msm_host *msm_host, + struct mmc_host *mmc, bool level) +{ + int load, ret; + struct mmc_ios ios; + + if (IS_ERR(mmc->supply.vqmmc) || + (mmc->ios.power_mode == MMC_POWER_UNDEFINED) || + (msm_host->vqmmc_enabled == level)) + return 0; + + if (msm_host->vqmmc_load) { + load = level ? msm_host->vqmmc_load : 0; + ret = regulator_set_load(mmc->supply.vqmmc, load); + if (ret) { + dev_err(mmc_dev(mmc), "%s: vqmmc set load failed: %d\n", + mmc_hostname(mmc), ret); + goto out; + } + } + + if (level) { + /* Set the IO voltage regulator to default voltage level */ + if (msm_host->caps_0 & CORE_3_0V_SUPPORT) + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_330; + else if (msm_host->caps_0 & CORE_1_8V_SUPPORT) + ios.signal_voltage = MMC_SIGNAL_VOLTAGE_180; + + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) { + ret = mmc_regulator_set_vqmmc(mmc, &ios); + if (ret < 0) { + dev_err(mmc_dev(mmc), "%s: vqmmc set volgate failed: %d\n", + mmc_hostname(mmc), ret); + goto out; + } + } + ret = regulator_enable(mmc->supply.vqmmc); + } else { + ret = regulator_disable(mmc->supply.vqmmc); + } + + if (ret) + dev_err(mmc_dev(mmc), "%s: vqmm %sable failed: %d\n", + mmc_hostname(mmc), level ? "en":"dis", ret); + else + msm_host->vqmmc_enabled = level; +out: + return ret; +} + static inline void sdhci_msm_init_pwr_irq_wait(struct sdhci_msm_host *msm_host) { init_waitqueue_head(&msm_host->pwr_irq_wait); @@ -1401,8 +1470,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host); + struct mmc_host *mmc = host->mmc; u32 irq_status, irq_ack = 0; - int retry = 10; + int retry = 10, ret; u32 pwr_state = 0, io_level = 0; u32 config; const struct sdhci_msm_offset *msm_offset = msm_host->offset; @@ -1440,21 +1510,42 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq) if (irq_status & CORE_PWRCTL_BUS_ON) { pwr_state = REQ_BUS_ON; io_level = REQ_IO_HIGH; - irq_ack |= CORE_PWRCTL_BUS_SUCCESS; } if (irq_status & CORE_PWRCTL_BUS_OFF) { pwr_state = REQ_BUS_OFF; io_level = REQ_IO_LOW; - irq_ack |= CORE_PWRCTL_BUS_SUCCESS; } + + if (pwr_state) { + ret = sdhci_msm_set_vmmc(mmc); + if (!ret) + ret = sdhci_msm_set_vqmmc(msm_host, mmc, + pwr_state & REQ_BUS_ON); + if (!ret) + irq_ack |= CORE_PWRCTL_BUS_SUCCESS; + else + irq_ack |= CORE_PWRCTL_BUS_FAIL; + } + /* Handle IO LOW/HIGH */ - if (irq_status & CORE_PWRCTL_IO_LOW) { + if (irq_status & CORE_PWRCTL_IO_LOW) io_level = REQ_IO_LOW; - irq_ack |= CORE_PWRCTL_IO_SUCCESS; - } - if (irq_status & CORE_PWRCTL_IO_HIGH) { + + if (irq_status & CORE_PWRCTL_IO_HIGH) io_level = REQ_IO_HIGH; + + if (io_level) irq_ack |= CORE_PWRCTL_IO_SUCCESS; + + if (io_level && !IS_ERR(mmc->supply.vqmmc) && !pwr_state) { + ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios); + if (ret < 0) { + dev_err(mmc_dev(mmc), "%s: IO_level setting failed(%d). signal_voltage: %d, vdd: %d irq_status: 0x%08x\n", + mmc_hostname(mmc), ret, + mmc->ios.signal_voltage, mmc->ios.vdd, + irq_status); + irq_ack |= CORE_PWRCTL_IO_FAIL; + } } /* @@ -1503,7 +1594,7 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq) if (io_level) msm_host->curr_io_level = io_level; - pr_debug("%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n", + dev_dbg(mmc_dev(mmc), "%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n", mmc_hostname(msm_host->mmc), __func__, irq, irq_status, irq_ack); } @@ -1833,6 +1924,98 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask) sdhci_reset(host, mask); } +static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host) +{ + int ret; + u32 vmmc_load; + struct mmc_host *mmc = msm_host->mmc; + + ret = mmc_regulator_get_supply(msm_host->mmc); + if (ret) + return ret; + device_property_read_u32(&msm_host->pdev->dev, + "vmmc-max-load-microamp", + &vmmc_load); + device_property_read_u32(&msm_host->pdev->dev, + "vqmmc-max-load-microamp", + &msm_host->vqmmc_load); + + /* Vmmc regulator can be turned off. So just set active load once */ + if (!IS_ERR(mmc->supply.vmmc) && vmmc_load) { + ret = regulator_set_load(mmc->supply.vmmc, vmmc_load); + if (ret) { + dev_err(mmc_dev(mmc), "%s: vmmc set active load failed: %d\n", + mmc_hostname(mmc), ret); + return ret; + } + } + + sdhci_msm_set_regulator_caps(msm_host); + mmc->ios.power_mode = MMC_POWER_UNDEFINED; + + return 0; + +} + +static int sdhci_msm_start_signal_voltage_switch(struct mmc_host *mmc, + struct mmc_ios *ios) +{ + struct sdhci_host *host = mmc_priv(mmc); + u16 ctrl, status; + + /* + * Signal Voltage Switching is only applicable for Host Controllers + * v3.00 and above. + */ + if (host->version < SDHCI_SPEC_300) + return 0; + + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); + + switch (ios->signal_voltage) { + case MMC_SIGNAL_VOLTAGE_330: + if (!(host->flags & SDHCI_SIGNALING_330)) + return -EINVAL; + + /* Set 1.8V Signal Enable in the Host Control2 register to 0 */ + ctrl &= ~SDHCI_CTRL_VDD_180; + break; + case MMC_SIGNAL_VOLTAGE_180: + if (!(host->flags & SDHCI_SIGNALING_180)) + return -EINVAL; + + /* + * Enable 1.8V Signal Enable in the Host Control2 + * register + */ + ctrl |= SDHCI_CTRL_VDD_180; + break; + case MMC_SIGNAL_VOLTAGE_120: + if (!(host->flags & SDHCI_SIGNALING_120)) + return -EINVAL; + return 0; + default: + /* No signal voltage switch required */ + return 0; + } + + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); + + /* Wait for 5ms */ + usleep_range(5000, 5500); + + /* regulator output should be stable within 5 ms */ + status = !!(ctrl & SDHCI_CTRL_VDD_180); + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (!!(ctrl & SDHCI_CTRL_VDD_180) == status) + return 0; + + dev_warn(mmc_dev(mmc), "%s: Regulator output did not became stable\n", + mmc_hostname(mmc)); + + return -EAGAIN; +} + static const struct sdhci_msm_variant_ops mci_var_ops = { .msm_readl_relaxed = sdhci_msm_mci_variant_readl_relaxed, .msm_writel_relaxed = sdhci_msm_mci_variant_writel_relaxed, @@ -1880,6 +2063,7 @@ static void sdhci_msm_reset(struct sdhci_host *host, u8 mask) .write_w = sdhci_msm_writew, .write_b = sdhci_msm_writeb, .irq = sdhci_msm_cqe_irq, + .set_power = sdhci_set_power_noreg, }; static const struct sdhci_pltfm_data sdhci_msm_pdata = { @@ -2072,6 +2256,10 @@ static int sdhci_msm_probe(struct platform_device *pdev) if (core_major == 1 && core_minor >= 0x49) msm_host->updated_ddr_cfg = true; + ret = sdhci_msm_register_vreg(msm_host); + if (ret) + goto clk_disable; + /* * Power on reset state may trigger power irq if previous status of * PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq @@ -2116,6 +2304,8 @@ static int sdhci_msm_probe(struct platform_device *pdev) MSM_MMC_AUTOSUSPEND_DELAY_MS); pm_runtime_use_autosuspend(&pdev->dev); + host->mmc_host_ops.start_signal_voltage_switch = + sdhci_msm_start_signal_voltage_switch; host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning; if (of_property_read_bool(node, "supports-cqe")) ret = sdhci_msm_cqe_add_host(host, pdev); @@ -2123,7 +2313,6 @@ static int sdhci_msm_probe(struct platform_device *pdev) ret = sdhci_add_host(host); if (ret) goto pm_runtime_disable; - sdhci_msm_set_regulator_caps(msm_host); pm_runtime_mark_last_busy(&pdev->dev); pm_runtime_put_autosuspend(&pdev->dev);